ECN Forum Forums General Topics of the Trade General Discussion Area prefab floor joists? how too?

For ease in stapling I use one of the Desa PowerFast staple guns.

I like the drawing, but would ask why drilling in the neutral plane of a TJI would have any more affect than drilling a hole in the same spot of dimensional lumber. I was told early on that the middle of a joist, top to bottom, is not doing any work to support the load above. However, if you drilled the same size hole near the top or bottom chord that you had effectively diminished the depth of the joist and its corresponding strength.

Here is another link to one of these discussions. https://www.electrical-contractor.net/ubb/Forum18/HTML/000022.html